On Mon, 2021-01-11 at 13:41 +0530, Anshuman Gupta wrote:
Add support for multiple mst stream in hdcp port data which will be used by RepeaterAuthStreamManage msg and HDCP 2.2 security f/w for m' validation.
Security f/w doesn't have any provision to mark the stream_type for each stream separately, it just take single input of stream_type while authenticating the port and applies the same stream_type to all streams. So driver mark each stream_type with common highest supported content type for all streams in DP MST Topology.
Security f/w supports RepeaterAuthStreamManage msg and m' validation only once during port authentication and encryption. Though it is not compulsory, security fw should support dynamic update of content_type and should support RepeaterAuthStreamManage msg and m' validation whenever required.
v2:
- Init the hdcp port data k for HDMI/DP SST stream.
v3:
- Cosmetic changes. [Uma]
v4:
- 's/port_auth/hdcp_port_auth'. [Ram]
- Commit log improvement.
v5:
- Comment and commit log improvement. [Ram]
v6:
- Check first connector connected status before intel_encoder_is_mst
to avoid any NULL pointer dereference.
Cc: Ramalingam C ramalingam.c@intel.com Reviewed-by: Uma Shankar uma.shankar@intel.com Reviewed-by: Ramalingam C ramalingam.c@intel.com Tested-by: Karthik B S karthik.b.s@intel.com Signed-off-by: Anshuman Gupta anshuman.gupta@intel.com
.../drm/i915/display/intel_display_types.h | 4 +- drivers/gpu/drm/i915/display/intel_hdcp.c | 113 +++++++++++++++- -- 2 files changed, 102 insertions(+), 15 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h index b74c10c8b01c..b37a02a73de6 100644 --- a/drivers/gpu/drm/i915/display/intel_display_types.h +++ b/drivers/gpu/drm/i915/display/intel_display_types.h @@ -1502,10 +1502,12 @@ struct intel_digital_port { enum phy_fia tc_phy_fia; u8 tc_phy_fia_idx; - /* protects num_hdcp_streams reference count, hdcp_port_data */ + /* protects num_hdcp_streams reference count, hdcp_port_data and hdcp_auth_status */ struct mutex hdcp_mutex; /* the number of pipes using HDCP signalling out of this port */ unsigned int num_hdcp_streams; + /* port HDCP auth status */ + bool hdcp_auth_status; /* HDCP port data need to pass to security f/w */ struct hdcp_port_data hdcp_port_data; diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.c b/drivers/gpu/drm/i915/display/intel_hdcp.c index 2bec26123a05..bd87694def74 100644 --- a/drivers/gpu/drm/i915/display/intel_hdcp.c +++ b/drivers/gpu/drm/i915/display/intel_hdcp.c @@ -26,6 +26,74 @@ #define KEY_LOAD_TRIES 5 #define HDCP2_LC_RETRY_CNT 3 +static int intel_conn_to_vcpi(struct intel_connector *connector) +{ + /* For HDMI this is forced to be 0x0. For DP SST also this is 0x0. */ + return connector->port ? connector->port->vcpi.vcpi : 0; +}
+/*
- intel_hdcp_required_content_stream selects the most highest
common possible HDCP
- content_type for all streams in DP MST topology because security
f/w doesn't
- have any provision to mark content_type for each stream
separately, it marks
- all available streams with the content_type proivided at the time
of port
- authentication. This may prohibit the userspace to use type1
content on
- HDCP 2.2 capable sink because of other sink are not capable of
HDCP 2.2 in
- DP MST topology. Though it is not compulsory, security fw should
change its
- policy to mark different content_types for different streams.
- */
+static int +intel_hdcp_required_content_stream(struct intel_digital_port *dig_port) +{ + struct drm_connector_list_iter conn_iter; + struct intel_digital_port *conn_dig_port; + struct intel_connector *connector; + struct drm_i915_private *i915 = to_i915(dig_port-
base.base.dev);
+ struct hdcp_port_data *data = &dig_port->hdcp_port_data; + bool enforce_type0 = false; + int k;
+ if (dig_port->hdcp_auth_status) + return 0;
+ drm_connector_list_iter_begin(&i915->drm, &conn_iter); + for_each_intel_connector_iter(connector, &conn_iter) { + if (connector->base.status == connector_status_disconnected) + continue;
+ if (!intel_encoder_is_mst(intel_attached_encoder(connector))) + continue;
+ conn_dig_port = intel_attached_dig_port(connector); + if (conn_dig_port != dig_port) + continue;
+ if (!enforce_type0 && !intel_hdcp2_capable(connector)) + enforce_type0 = true;
+ data->streams[data->k].stream_id = intel_conn_to_vcpi(connector); + data->k++;
+ /* if there is only one active stream */ + if (dig_port->dp.active_mst_links <= 1) + break; + } + drm_connector_list_iter_end(&conn_iter);
+ if (drm_WARN_ON(&i915->drm, data->k > INTEL_NUM_PIPES(i915) || data->k == 0)) + return -EINVAL;
+ /* + * Apply common protection level across all streams in DP MST Topology. + * Use highest supported content type for all streams in DP MST Topology. + */ + for (k = 0; k < data->k; k++) + data->streams[k].stream_type = + enforce_type0 ? DRM_MODE_HDCP_CONTENT_TYPE0 : DRM_MODE_HDCP_CONTENT_TYPE1;
+ return 0; +}
static bool intel_hdcp_is_ksv_valid(u8 *ksv) { @@ -1471,13 +1539,14 @@ static int _hdcp2_propagate_stream_management_info(struct intel_connector *connector) { struct intel_digital_port *dig_port = intel_attached_dig_port(connector); + struct hdcp_port_data *data = &dig_port->hdcp_port_data; struct intel_hdcp *hdcp = &connector->hdcp; union { struct hdcp2_rep_stream_manage stream_manage; struct hdcp2_rep_stream_ready stream_ready; } msgs; const struct intel_hdcp_shim *shim = hdcp->shim; - int ret; + int ret, streams_size_delta, i; if (connector->hdcp.seq_num_m > HDCP_2_2_SEQ_NUM_MAX) return -ERANGE; @@ -1486,16 +1555,18 @@ int _hdcp2_propagate_stream_management_info(struct intel_connector *connector) msgs.stream_manage.msg_id = HDCP_2_2_REP_STREAM_MANAGE; drm_hdcp_cpu_to_be24(msgs.stream_manage.seq_num_m, hdcp-
seq_num_m);
- /* K no of streams is fixed as 1. Stored as big-endian. */ - msgs.stream_manage.k = cpu_to_be16(1); + msgs.stream_manage.k = cpu_to_be16(data->k); - /* For HDMI this is forced to be 0x0. For DP SST also this is 0x0. */ - msgs.stream_manage.streams[0].stream_id = 0; - msgs.stream_manage.streams[0].stream_type = hdcp-
content_type;
+ for (i = 0; i < data->k; i++) { + msgs.stream_manage.streams[i].stream_id = data-
streams[i].stream_id;
+ msgs.stream_manage.streams[i].stream_type = data-
streams[i].stream_type;
+ } + streams_size_delta = (HDCP_2_2_MAX_CONTENT_STREAMS_CNT - data->k) * + sizeof(struct hdcp2_streamid_type); /* Send it to Repeater */ ret = shim->write_2_2_msg(dig_port, &msgs.stream_manage, - sizeof(msgs.stream_manage)); + sizeof(msgs.stream_manage) - streams_size_delta); if (ret < 0) goto out; @@ -1504,8 +1575,7 @@ int _hdcp2_propagate_stream_management_info(struct intel_connector *connector) if (ret < 0) goto out; - dig_port->hdcp_port_data.seq_num_m = hdcp->seq_num_m; - dig_port->hdcp_port_data.streams[0].stream_type = hdcp-
content_type;
+ data->seq_num_m = hdcp->seq_num_m; ret = hdcp2_verify_mprime(connector, &msgs.stream_ready); @@ -1666,6 +1736,7 @@ static int hdcp2_enable_encryption(struct intel_connector *connector) port), LINK_ENCRYPTION_STATUS, HDCP_ENCRYPT_STATUS_CHANGE_TIMEOUT_MS); + dig_port->hdcp_auth_status = true; return ret; } @@ -1740,11 +1811,9 @@ static int hdcp2_authenticate_and_encrypt(struct intel_connector *connector) { struct intel_digital_port *dig_port = intel_attached_dig_port(connector); struct drm_i915_private *i915 = to_i915(connector->base.dev); - struct hdcp_port_data *data = &dig_port->hdcp_port_data; - struct intel_hdcp *hdcp = &connector->hdcp; - int ret, i, tries = 3; + int ret = 0, i, tries = 3; - for (i = 0; i < tries; i++) { + for (i = 0; i < tries && !dig_port->hdcp_auth_status; i++) { ret = hdcp2_authenticate_sink(connector); if (!ret) { ret = hdcp2_propagate_stream_management_info(connector); @@ -1754,7 +1823,7 @@ static int hdcp2_authenticate_and_encrypt(struct intel_connector *connector) ret); break; } - data->streams[0].stream_type = hdcp-
content_type;
ret = hdcp2_authenticate_port(connector); if (!ret) break; @@ -1789,7 +1858,9 @@ static int hdcp2_authenticate_and_encrypt(struct intel_connector *connector) static int _intel_hdcp2_enable(struct intel_connector *connector) { + struct intel_digital_port *dig_port = intel_attached_dig_port(connector); struct drm_i915_private *i915 = to_i915(connector->base.dev); + struct hdcp_port_data *data = &dig_port->hdcp_port_data; struct intel_hdcp *hdcp = &connector->hdcp; int ret; @@ -1797,6 +1868,16 @@ static int _intel_hdcp2_enable(struct intel_connector *connector) connector->base.name, connector->base.base.id, hdcp->content_type); + /* Stream which requires encryption */ + if (!intel_encoder_is_mst(intel_attached_encoder(connector))) { + data->k = 1; + data->streams[0].stream_type = hdcp->content_type; + } else { + ret = intel_hdcp_required_content_stream(dig_port); + if (ret) + return ret; + }
ret = hdcp2_authenticate_and_encrypt(connector); if (ret) { drm_dbg_kms(&i915->drm, "HDCP2 Type%d Enabling Failed. (%d)\n", @@ -1814,7 +1895,9 @@ static int _intel_hdcp2_enable(struct intel_connector *connector) static int _intel_hdcp2_disable(struct intel_connector *connector) { + struct intel_digital_port *dig_port = intel_attached_dig_port(connector); struct drm_i915_private *i915 = to_i915(connector->base.dev); + struct hdcp_port_data *data = &dig_port->hdcp_port_data; int ret; drm_dbg_kms(&i915->drm, "[%s:%d] HDCP2.2 is being Disabled\n", @@ -1826,6 +1909,8 @@ static int _intel_hdcp2_disable(struct intel_connector *connector) drm_dbg_kms(&i915->drm, "Port deauth failed.\n"); connector->hdcp.hdcp2_encrypted = false; + dig_port->hdcp_auth_status = false; + data->k = 0; return ret; }
Verified NULL pointer dereference fixed in cros with mst dock setup Tested-by: Juston Li juston.li@intel.com Acked-by: Juston Li juston.li@intel.com